19
PROBLEM
POSSIBLE CAUSE
REMEDY
No power display on
panel or any one of the
buttons failure.
Power failure
Check the power supplier if the power supplier is supplied to the
unit. Check the power cord and correct if damaged.
Transformer (Discharge
transformer before
testing)
Check resistance between the two input/output lines on transformer.
Replace the transformer if either of the input/output is open or the
transformer is damaged.
Display board or main
PCB failure
Check the voltage on display board. Replace the display board if it
is +5V else replace the main PCB.
Fan motor runs
intermittently
Cycles on overload.
Check voltage. Call an electrician if not within limits.
Test capacitor. Replace if not /-10% of manufacture's
rating.
Check bearings. Replace the motor if the blower wheel cannot
rotate freely.
Pay attention to any change from high speed to low speed. Replace
the motor if the speed does not change.
Compressor stops
instantly after startup.
Refrigerant
The amount of the refrigerant is too much, making the compressor
load too big. Recycle and recharge the refrigerant after checking for
the reason.
Compressor
The compressor is blocked inside. Replace after checking for the
reason.
Fan motor will not run.
No power
Check voltage at electrical outlet. Correct if none.
Water alarm
Check and correct if water alarm happens.
Power supply cord
Check voltage at the power cord terminal on Main PCB. Replace
the power cord if none.
Transformer (Discharge
transformer before
testing)
Check resistance between the two input/output lines on transformer.
Replace the transformer if either of the input/output is open or the
transformer is damaged.
Wire disconnected or
connection loose
Connect wire. Refer to wiring diagram for terminal identification.
Repair or replace loose terminal.
Main PCB failure
Select fan speed and Check the voltage on main PCB. Replace the
main PCB if no voltage in anyone.
Capacitor (Discharge
capacitor before testing)
Test capacitor. Replace if not /-10% of manufacture's rating.
Replace if shorted, open or damaged.
Fan motor noise.
Fan blower
Replace the fan blower if cracked, out of balance, or partially
missing.
Loose screws
Tighten them.
Worn bearings
Replace the motor if knocking sounds continue when running or
loose, or the motor hums or noise appears to be internal while
running.
